Broomfield County leans Democratic by roughly 26 points: about 63% of voters vote Democratic and 37% Republican.
About 83% of adults in Broomfield County typically vote, above the U.S. average of about 62%. Among adults in Broomfield County, ~52% vote Democratic, ~31% Republican, and ~17% don't vote. The map below shows estimated turnout by block group.
How Broomfield County compares
Among counties within 50 miles, Broomfield County leans more Democratic than 10 of 12 neighbors.
Broomfield County runs about 14 points more Democratic than Colorado as a whole.
Politics vary noticeably by city within Broomfield County. The southwest side is the most Democratic-leaning (D+35) and the east side is the least Democratic-leaning (D+16), a spread of about 20 points.
Why Broomfield County leans the way it does
This analysis examined 14,881 data points per county to find what predicts political lean and turnout. The items below are a few correlations that stood out for Broomfield County, not a ranked or complete list of what matters most.
Areas with high college attainment vote Democratic. About 60% of adults in Broomfield County hold a bachelor's degree, about 32 points above the U.S. average of 28%. Dense areas vote Democratic, and Broomfield County sits in the top fifth on density (about 86%, above 97% of counties).
Preventive-care access and voter turnout
Places with strong routine preventive-care access tend to turn out at a higher rate; Broomfield County, CO sits in the top tenth nationally on this measure. Dental visits do not drive turnout; the rate reflects income, insurance, and healthcare access, which line up with who votes.
Why turnout in Broomfield County looks the way it does
Areas with strong routine healthcare access turn out at higher rates. Broomfield County is in the top quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. The dental-visit rate here is about 70%, about 10 points above the U.S. average of 60%. High high-school completion lines up with higher turnout, and about 96% of adults in Broomfield County have completed high school, above 97% of counties. Learn more about the findings and methodology on the political spectrum map.
Nearby Counties
- Adams County, CO D+11
- Boulder County, CO D+52
- Jefferson County, CO D+18
- Denver County, CO D+53
- Gilpin County, CO D+16
- Arapahoe County, CO D+22
- Weld County, CO R+17
- Clear Creek County, CO D+21
- Douglas County, CO R+7
- Larimer County, CO D+16
Counties with Similar Populations
- Somerset County, PA R+54
- Vermilion County, IL R+22
- Wood County, WI R+22
- Lonoke County, AR R+52
- Scioto County, OH R+47
- Lea County, NM R+50
- Raleigh County, WV R+46
- Putnam County, FL R+42
- Hancock County, OH R+32
- Kauai County, HI D+20
Sources and methodology
Precinct-level voting records used to fit the model come from Colorado Secretary of State, Elections, distributed by the Voting and Election Science Team. Demographic inputs come from the U.S. Census Bureau (ACS 5-year estimates and the 2020 Decennial Census). Health and environmental inputs come from the CDC (PLACES and the Environmental Justice Index). Land cover comes from the USGS and EPA. Election-day and lead-up weather come from PRISM 4km daily grids and the NOAA Global Historical Climatology Network. Mail-voting and election-administration patterns come from the MIT Election Lab's Survey of the Performance of American Elections. Block-group crime detail comes from CrimeGrade. Internet data and modeling support provided by ISPreports.org.
Modeling and analysis by the BestNeighborhood data science team. Full methodology and findings: political spectrum map.
Methodology reviewed by the BestNeighborhood data team. Last updated May 2026.